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Keywords:

  • enzyme models;
  • phycocyanobilin;
  • phytochrome
Thumbnail image of graphical abstract

The new phytochrome model compound 1 is characterized by the covalent linkage of a serine side chain with the ring-A lactam of the phycocyanobilin chromophore. The model readily explains the absorption properties, ensures photoreversibility, and offers the possibility for thermal back reaction.